modelconv 0.1.1

Converter for neural models into various formats.

ModelConverter - Compilation Library

Convert your ONNX models to a format compatible with any generation of Luxonis camera using the Model Compilation Library.

Status

Package	Test	Deploy
RVC2
RVC3
RVC4
Hailo

Table of Contents

• MLOps - Compilation Library
  • Table of Contents
  • Installation
    • GPU Support
  • Running ModelConverter
    • Sharing Files
    • Usage
    • Examples
  • Multi-Stage Conversion
  • Interactive Mode
  • Calibration Data
  • Inference
    • Inference Example
  • Benchmarking

Installation

Before You Begin

ModelConverter is in an experimental public beta stage. Some parts might change in the future.

To build the images, you need to download additional packages depending on the selected target.

RVC2 and RVC3

Requires openvino_2022_3_vpux_drop_patched.tar.gz to be present in docker/extra_packages. You can download the archive here.

RVC4

Requires snpe.zip archive to be present in docker/extra_packages. You can download an archive with the current version here. You only need to rename it to snpe.zip and place it in the docker/extra_packages directory.

HAILO

Requires hailo_ai_sw_suite_2024-04:1 docker image to be present on the system. You can download the image from the Hailo website.

Building the Image

1. Ensure docker is installed on your machine. If not, refer to the installation guide here.

2. Install the modelconverter package. You can install it from PyPI using the following command:

   pip install modelconv
   

3. Build the docker image:

docker build -f docker/<package>/Dockerfile.public -t luxonis/modelconverter-<package>:latest .

This will also install the modelconverter CLI. For usage instructions, see modelconverter --help.

GPU Support

To enable GPU acceleration for hailo conversion, install the Nvidia Container Toolkit.

Running ModelConverter

Configuration for the conversion predominantly relies on a yaml config file. For reference, see defaults.yaml and other examples located in the shared_with_container/configs directory.

However, you have the flexibility to modify specific settings without altering the config file itself. This is done using command line arguments. You provide the arguments in the form of key value pairs. For better understanding, see Examples.

Sharing Files

When using the supplied docker-compose.yaml, the shared_with_container directory facilitates file sharing between the host and container. This directory is mounted as /app/shared_with_container/ inside the container. You can place your models, calibration data, and config files here. The directory structure is:

shared_with_container/
│
├── calibration_data/
│ └── <calibration data will be downloaded here>
│
├── configs/
│ ├── resnet18.yaml
│ └── <configs will be downloaded here>
│
├── models/
│ ├── resnet18.onnx
│ └── <models will be downloaded here>
│
└── outputs/
  └── <output_dir_name>
    ├── resnet18.onnx
    ├── resnet18.dlc
    ├── logs.txt
    ├── config.yaml
    └── intermediate_outputs/
      └── <intermediate files generated during the conversion>

While adhering to this structure is not mandatory as long as the files are visible inside the container, it is advised to keep the files organized.

The converter first searches for files exactly at the provided path. If not found, it searches relative to /app/shared_with_container/.

The output_dir_name can be specified in the config file. If such a directory already exists, the output_dir_name will be appended with the current date and time. If not specified, the output_dir_name will be autogenerated in the following format: <model_name>_to_<target>_<date>_<time>.

Usage

You can run the built image either manually using the docker run command or using the modelconverter CLI.

1. Set your credentials as environment variables (if required):

   export AWS_SECRET_ACCESS_KEY=<your_aws_secret_access_key>
   export AWS_ACCESS_KEY_ID=<your_aws_access_key_id>
   export AWS_S3_ENDPOINT_URL=<your_aws_s3_endpoint_url>
   

2. If shared_with_container directory doesn't exist on your host, create it.

3. Without remote files, place the model, config, and calibration data in the respective directories (refer Sharing Files).

4. Execute the conversion:

• If using the docker run command:

  docker run --rm -it \
    -v $(pwd)/shared_with_container:/app/shared_with_container/ \
    -e AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY \
    -e AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID \
    -e AWS_S3_ENDPOINT_URL=$AWS_S3_ENDPOINT_URL \
    luxonis/modelconverter-<package>:latest \
    convert <target> \
    --path <s3_url_or_path> [ config overrides ]
  

• If using the modelconverter CLI:

  modelconverter convert <target> --path <s3_url_or_path> [ config overrides ]
  

• If using docker-compose:

  docker compose run <target> convert <target> ...
  

Examples

Use resnet18.yaml config, but override calibration.path:

modelconverter convert rvc4 --path configs/resnet18.yaml \
                        calibration.path s3://path/to/calibration_data

Override inputs and outputs with command line arguments:

modelconverter convert rvc3 --path configs/resnet18.yaml \
                        inputs.0.name input_1 \
                        inputs.0.shape "[1,3,256,256]" \
                        outputs.0.name output_0

Specify all options via the command line without a config file:

modelconverter convert rvc2 input_model models/yolov6n.onnx \
                        scale_values "[255,255,255]" \
                        reverse_input_channels True \
                        shape "[1,3,256,256]" \
                        outputs.0.name out_0 \
                        outputs.1.name out_1 \
                        outputs.2.name out_2

Multi-Stage Conversion

The converter supports multi-stage conversion. This means conversion of multiple models where the output of one model is the input to another model. For mulit-stage conversion you must specify the stages section in the config file, see defaults.yaml and multistage.yaml for reference.

The output directory structure would be (assuming RVC4 conversion):

output_path/
├── config.yaml
├── modelconverter.log
├── stage_name1
│   ├── config.yaml
│   ├── intermediate_outputs/
│   ├── model1.onnx
│   └── model1.dlc
└── stage_name2
    ├── config.yaml
    ├── intermediate_outputs/
    ├── model2.onnx
    └── model2.dlc

Interactive Mode

Run the container interactively without any post-target arguments:

modelconverter shell rvc4

Inside, you'll find all the necessary tools for manual conversion. The modelconverter CLI is available inside the container as well.

Calibration Data

Calibration data can be a mix of images (.jpg, .png, .jpeg) and .npy, .raw files. Image files will be loaded and converted to the format specified in the config. No conversion is performed for .npy or .raw files, the files are used as provided. NOTE for RVC4: RVC4 expects images to be provided in NHWC layout. If you provide the calibration data in a form of .npy or .raw format, you need to make sure they have the correct layout.

Inference

A basic support for inference. To run the inference, use modelconverter infer <target> <args>. For usage instructions, see modelconverter infer --help.

The input files must be provided in a specific directory structure.

input_path/
├── <name of first input node>
│   ├── 0.npy
│   ├── 1.npy
│   └── ...
├── <name of second input node>
│   ├── 0.npy
│   ├── 1.npy
│   └── ...
├── ...
└── <name of last input node>
    ├── 0.npy
    ├── 1.npy
    └── ...

Note: The numpy files are sent to the model with no preprocessing, so they must be provided in the correct format and shape.

The output files are then saved in a similar structure.

Inference Example

For yolov6n model, the input directory structure would be:

input_path/
└── images
    ├── 0.npy
    ├── 1.npy
    └── ...

To run the inference, use:

modelconverter infer rvc4 \
  --model_path <path_to_model.dlc> \
  --dest <dest> \
  --input_path <input_path>
  --path <path_to_config.yaml>

The output directory structure would be:

output_path/
├── output1_yolov6r2
│   ├── 0.npy
│   ├── 1.npy
│   └── ...
├── output2_yolov6r2
│   └── <outputs>
└── output3_yolov6r2
    └── <outputs>

Benchmarking

The ModelConverter additionally supports benchmarking of converted models.

To install the package with the benchmarking dependencies, use:

pip install modelconv[bench]

To run the benchmark, use modelconverter benchmark <target> <args>.

For usage instructions, see modelconverter benchmark --help.

Example:

modelconverter benchmark rvc3 --model-path <path_to_model.xml>

The command prints a table with the benchmark results to the console and optionally saves the results to a .csv file.